D looks like the oldest one because there is barley anything there. if not then I would do b
A double layer of phospholipids
I believe it is “animals and plants caanot directly use all the nitrogen found in our atmosphere”
Which of these pieces of legislation was an important step in limiting slavery?
High-residue cover cropping is an adaption of conservation tillage in which a high-biomass cover crop is grown during the winter and is rolled or cut down prior to no-till or strip-till planting in spring.
